import { Controller, Get, Query } from '@nestjs/common';
import { ApiTags, ApiOperation, ApiResponse, ApiBearerAuth } from '@nestjs/swagger';
import { Roles, CurrentUser } from '@app/auth';

// DTOs for dashboard queries
class DashboardQueryDto {
  period?: 'day' | 'week' | 'month' | 'year' = 'week';
  startDate?: string;
  endDate?: string;
}

@ApiTags('仪表板')
@ApiBearerAuth()
@Controller('admin/dashboard')
export class DashboardController {
  constructor() {}

  @Get('overview')
  @ApiOperation({ summary: '获取仪表板概览数据' })
  @ApiResponse({ status: 200, description: '返回仪表板概览数据' })
  @Roles('admin', 'editor')
  async getOverview(@CurrentUser() user: any) {
    // TODO: 获取仪表板概览统计数据
    return {
      code: 200,
      data: {
        stats: {
          totalPosts: 0,
          publishedPosts: 0,
          draftPosts: 0,
          totalUsers: 0,
          activeUsers: 0,
          totalViews: 0,
          totalComments: 0,
          totalCategories: 0,
          totalTags: 0
        },
        trends: {
          postsGrowth: '0%',
          usersGrowth: '0%',
          viewsGrowth: '0%',
          commentsGrowth: '0%'
        },
        recentActivity: []
      },
      message: '获取成功'
    };
  }

  @Get('stats/posts')
  @ApiOperation({ summary: '获取文章统计数据' })
  @ApiResponse({ status: 200, description: '返回文章统计数据' })
  @Roles('admin', 'editor')
  async getPostStats(@Query() query: DashboardQueryDto) {
    // TODO: 获取文章相关统计数据
    return {
      code: 200,
      data: {
        totalPosts: 0,
        publishedPosts: 0,
        draftPosts: 0,
        archivedPosts: 0,
        topPosts: 0,
        postsWithComments: 0,
        averagePostLength: 0,
        mostViewedPosts: [],
        mostLikedPosts: [],
        recentPosts: [],
        postsByCategory: [],
        postsByTag: [],
        publishingTrend: [], // 按时间的发布趋势
        viewsTrend: [], // 按时间的浏览趋势
        period: query.period
      },
      message: '获取成功'
    };
  }

  @Get('stats/users')
  @ApiOperation({ summary: '获取用户统计数据' })
  @ApiResponse({ status: 200, description: '返回用户统计数据' })
  @Roles('admin')
  async getUserStats(@Query() query: DashboardQueryDto) {
    // TODO: 获取用户相关统计数据
    return {
      code: 200,
      data: {
        totalUsers: 0,
        activeUsers: 0,
        inactiveUsers: 0,
        bannedUsers: 0,
        adminUsers: 0,
        editorUsers: 0,
        authorUsers: 0,
        regularUsers: 0,
        newUsersThisPeriod: 0,
        topAuthors: [], // 按文章数排序的作者
        userRegistrationTrend: [], // 用户注册趋势
        userActivityTrend: [], // 用户活跃度趋势
        usersByRole: [],
        usersByStatus: [],
        period: query.period
      },
      message: '获取成功'
    };
  }

  @Get('stats/traffic')
  @ApiOperation({ summary: '获取流量统计数据' })
  @ApiResponse({ status: 200, description: '返回流量统计数据' })
  @Roles('admin', 'editor')
  async getTrafficStats(@Query() query: DashboardQueryDto) {
    // TODO: 获取网站流量统计数据
    return {
      code: 200,
      data: {
        totalViews: 0,
        uniqueVisitors: 0,
        pageViews: 0,
        bounceRate: '0%',
        averageSessionDuration: '0s',
        topPages: [], // 最受欢迎的页面
        topReferrers: [], // 主要来源网站
        deviceStats: {
          desktop: 0,
          mobile: 0,
          tablet: 0
        },
        browserStats: [],
        osStats: [],
        countryStats: [],
        trafficTrend: [], // 流量趋势
        viewsTrend: [], // 浏览量趋势
        period: query.period
      },
      message: '获取成功'
    };
  }

  @Get('stats/content')
  @ApiOperation({ summary: '获取内容统计数据' })
  @ApiResponse({ status: 200, description: '返回内容统计数据' })
  @Roles('admin', 'editor')
  async getContentStats(@Query() query: DashboardQueryDto) {
    // TODO: 获取内容相关统计数据
    return {
      code: 200,
      data: {
        totalCategories: 0,
        totalTags: 0,
        totalComments: 0,
        approvedComments: 0,
        pendingComments: 0,
        spamComments: 0,
        averageCommentsPerPost: 0,
        mostUsedCategories: [],
        mostUsedTags: [],
        contentLengthDistribution: [],
        commentsTrend: [], // 评论趋势
        categoryUsageTrend: [], // 分类使用趋势
        tagUsageTrend: [], // 标签使用趋势
        period: query.period
      },
      message: '获取成功'
    };
  }

  @Get('stats/performance')
  @ApiOperation({ summary: '获取系统性能统计' })
  @ApiResponse({ status: 200, description: '返回系统性能统计' })
  @Roles('admin')
  async getPerformanceStats() {
    // TODO: 获取系统性能数据
    return {
      code: 200,
      data: {
        system: {
          cpuUsage: '0%',
          memoryUsage: '0%',
          diskUsage: '0%',
          networkIn: '0KB/s',
          networkOut: '0KB/s',
          uptime: process.uptime()
        },
        database: {
          connections: 0,
          queryTime: '0ms',
          slowQueries: 0,
          diskUsage: '0MB'
        },
        cache: {
          hitRate: '0%',
          missRate: '0%',
          memory: '0MB',
          keys: 0
        },
        responseTime: {
          average: '0ms',
          p95: '0ms',
          p99: '0ms'
        },
        errors: {
          total: 0,
          last24h: 0,
          errorRate: '0%'
        }
      },
      message: '获取成功'
    };
  }

  @Get('activity/recent')
  @ApiOperation({ summary: '获取最近活动' })
  @ApiResponse({ status: 200, description: '返回最近活动列表' })
  @Roles('admin', 'editor')
  async getRecentActivity(@Query() query: { limit?: number }) {
    // TODO: 获取最近的系统活动
    return {
      code: 200,
      data: {
        activities: [
          // TODO: 返回最近的活动数据
          // 包括文章发布、用户注册、评论等活动
        ],
        total: 0
      },
      message: '获取成功'
    };
  }

  @Get('notifications')
  @ApiOperation({ summary: '获取系统通知' })
  @ApiResponse({ status: 200, description: '返回系统通知' })
  @Roles('admin', 'editor')
  async getNotifications(@CurrentUser() user: any) {
    // TODO: 获取管理员相关的系统通知
    return {
      code: 200,
      data: {
        notifications: [
          // TODO: 返回通知数据
          // 包括系统警告、待审核内容、重要事件等
        ],
        unreadCount: 0,
        total: 0
      },
      message: '获取成功'
    };
  }

  @Get('quick-actions')
  @ApiOperation({ summary: '获取快速操作选项' })
  @ApiResponse({ status: 200, description: '返回快速操作选项' })
  @Roles('admin', 'editor')
  async getQuickActions(@CurrentUser() user: any) {
    // TODO: 根据用户角色返回可用的快速操作
    const actions = [
      {
        id: 'create-post',
        title: '创建文章',
        description: '快速创建新文章',
        icon: 'edit',
        url: '/admin/posts/create',
        permission: ['admin', 'editor', 'author']
      },
      {
        id: 'manage-users',
        title: '用户管理',
        description: '管理系统用户',
        icon: 'users',
        url: '/admin/users',
        permission: ['admin']
      },
      {
        id: 'system-settings',
        title: '系统设置',
        description: '配置系统设置',
        icon: 'settings',
        url: '/admin/system',
        permission: ['admin']
      },
      {
        id: 'clear-cache',
        title: '清除缓存',
        description: '清除系统缓存',
        icon: 'refresh',
        action: 'clear-cache',
        permission: ['admin']
      }
    ];

    // TODO: 根据用户权限过滤操作
    return {
      code: 200,
      data: {
        actions: actions.filter(action => 
          action.permission.includes(user.role)
        )
      },
      message: '获取成功'
    };
  }
}
